Topic
sound waves
Technology Hardware #ultrasonic#espresso
Ultrasonic espresso machine brews coffee without heat using sound waves, cutting energy by 75%
Researchers at the School of Chemical Engineering in Sydney have created an espresso machine that uses ultrasound instead of heat, brewing coffee in under three minutes at room temperature with 75% less energy. In blind taste tests, 100 coffee drinkers could not distinguish the ultrasonic espresso from traditional hot-brewed espresso. The technology could find applications in home machines, cafes, and ready-to-drink coffee products.
Jun 15, 2026 1 source
Technology Hardware #sound waves#audio technology
Visualizing Sound Waves with a Unique Testing Rig
A YouTuber named PlasmatronX has developed a unique testing rig that visualizes sound waves, allowing for a comparison between surround speakers and soundbars. This experiment highlights the impact of room acoustics on audio quality.
Jun 10, 2026 1 source